6.2.1: Connect Multiple Displays
QOne cable (housing two-wire RS-485 and two-wire power wires plus shield) is used to connect the
displays. One port of the Nexus meter supports 12 VA. Each P40N, P41N or P43N requires 3.3 VA
(maximum 3.8 VA). The Master Display (P40N) is the master in communication. The Amp, Power
and Nexus devices are slaves in communication. Therefore, the Master Display (P40N) should be at
the end of the daisy-chained units as shown in Figure 6.2 below. The Nexus port is set at 1.
Protocol is Modbus RTU and Baud Rate is 9600.
NOTE: The power lines in Figure 6.2
are shown separate for clarity.
All lines are actually in one cable.
QShown here are diagrams of the
P41N and P43N Displays with
example readings on each screen.
6.2.2: Nexus P40N ModesQThe Nexus P40N LED External Display has three modes:
•Dynamic Readings Mode (section 6.3 and 6.4)
•Nexus Information Mode (section 6.5 and 6.6)
•Display Features Mode (section 6.7 and 6.8)
QEach Mode is divided into Groups. Most Groups are further broken down into Readings.
•Use the MODE button to scroll between Modes.
•Use the UP/DOWN arrows to scroll from Group to Group within each Mode.
•Use the LEFT/RIGHT arrows to scroll from Reading to Reading within each Group.
QUse the Communicator EXT software to Flash Update the P40N External Display.
Electro Industries/GaugeTech
Doc #: E107706 V1.256-2
P40N
P41N
P43N
+V-V S B(-) A(+) +V -V S B(-) A(+) +V -V S B(-) A(+) +V -V S B(-) A(+)
NEXUS UNIT
Figure 6.2: P40N Display Daisy Chain
Figure 6.3: P41N Display Figure 6.4: P43N Display